Reinsurance Level 4 Reinsurance Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Assumed Premiums Earned	$ 113	$ 74	$ 13
Ceded Premiums Earned	(1,801)	(2,060)	(1,869)
Life Annuity Accident and Health Insurance Product Line [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Fee Income Earned Premium and Other Life	2,877	3,228	3,502
Assumed Premiums Earned	113	74	13
Ceded Premiums Earned	(1,801)	(2,060)	(1,869)
Net Fee Income Earned Premium and Other Life	1,189	1,242	$ 1,646
Investment Contracts [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Financial Liabilities Fair Value Disclosure	$ 682	$ 851